Energy changes: displacement practical
I can complete a practical to measure the temperature change in a displacement reaction, record results, analyse data, and write a conclusion.
Energy changes: displacement practical
I can complete a practical to measure the temperature change in a displacement reaction, record results, analyse data, and write a conclusion.
Lesson details
Key learning points
- Displacement reactions involve a more reactive element replacing another in a compound.
- Exothermic reactions release energy to the surroundings, often through heating.
- The initial and final temperatures of the reaction mixture need to be recorded to calculate energy change.
- Hypotheses guide predictions about the effect of variables in experiments.
- Bar charts can visually represent collected results to help analyse data.
Common misconception
Pupils often measure the final temperature of the reaction mixture rather than the highest temperature.
Encourage pupils to keep monitoring the temperature until it starts to decrease; that way they will know they have seen the highest temperature.
Keywords
Displacement - The more reactive element takes the place of a less reactive element in a compound.
Exothermic - Exothermic chemical reaction is a type of reaction in which energy is transferred from the reaction to the surroundings e.g. combustion.
Hypothesis - A prediction that is supported with an explanation.
Conclusion - Sums up what has been found out during the investigation. It always refers to both the independent and dependent variables.
Bar chart - A chart showing solid columns; to present data usually used when one variable is discrete.
Equipment
A selection of metals as fine particles, a metal salt solution, polystyrene or insulated cups with lids, thermometers, balances and measuring cylinders.
Licence
This content is © Oak National Academy Limited (2024), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).
Video
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